Attribute Macro main 

#[main]

Main function attribute macro for fastn applications with context support.

This macro transforms your async main function to automatically set up the tokio runtime and initialize global context management. It’s the recommended way to start fastn applications.

Features

• Automatically creates a multi-threaded tokio runtime
• Enables all tokio features (time, net, fs, etc.)
• Sets up global context management
• Provides clean error handling

Example

use fastn_context::main;

#[main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    println!("Application starting");
     
    // Global context is available
    let ctx = fastn_context::global().await;
    println!("App context: {}", ctx.name());
     
    Ok(())
}

Return Types

Your main function can return:

• () - No error handling
• Result<(), E> where E: std::error::Error - With error handling

Generated Code

The macro generates a standard fn main() that creates the tokio runtime and calls your async function. Error handling is automatically provided.